Author(s): S Sarkar, SN Mohanty, KC Nayak, C Pradhan, KN Mohanta, C Devaraj

Abstract: A sixty days growth study was conducted on feeding 15, 20, 25 30% crude protein (CP) containing diets to Jayanti rohu fingerlings to quantify their protein requirement. Fingerlings of 8.39 ± 0.10 were stocked in triplicate ferro-cemented tanks fed ad libitum twice daily. Performances of fish were evaluated on the basis of weight gain, whole body proximate composition, FCR, SGR, PER, PRE, LRE, ERE etc. Results indicated that fish fed on 25% CP containing diet grew the best or almost same or comparable with 30% CP diet, carcass crude protein (70.01% ± 0.02) Crude Lipid (14.12 ± 0.39%) is also highest than other diet group. The mean final body weight of different groups was 8.40 ± 0.16, 10.02 ± 0.13, 14.19 ± 0.11 14.50 ± 10 g when fed diet containing 15, 20, 25 30% CP respectively. The growth performance of fish fed on 25 and 30% protein containing diets were significantly higher that of other two dietary treatments. Maximum specific growth rate (SGR) was found 4.15 ± 0.14 4.22 in the case of 4.22 ± 0.023 in the case of 25 30% protein respectively. The fish fed on 25 and 30% protein containing diets had the significantly lower carcass moisture, highest carcass protein and lipid as well as energy concentration. Feeding lower levels of protein resulted in deposition of significantly higher levels of whole body ash content. Maximum protein retention (PRE) (44.61 ± 0.003) energy retention of efficiency (ERE) – (124.37 ± 0.64), protein efficiency ratio (PER) (2.04 ± 0.01) was observed in fish fed on 25% protein diet best FCR (1.91 ± 0.008) was achieved on 25% protein diet. So we can conclude this study that 25% protein diet is best for protein diet in the best for growth of Jayanti rohu fingerling.

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